What is a simple way to estimate the depth of a pit in a vessel?

The correct approach to estimate the depth of a pit in a pressure vessel is to use a depth gauge. This tool is specifically designed for measuring the depth of holes and pits accurately, providing a reliable measurement without the potential for error associated with other methods. Depth gauges can be adjusted and are calibrated to ensure precision in measurement, which is crucial in the context of pressure vessel inspections for assessing potential corrosion and weld integrity.

Using a mechanical pencil, for instance, is not a practical or accurate method for measuring pit depths. It lacks the precision needed for such assessments and can lead to inaccurate readings. Similarly, while measuring with a ruler may seem straightforward, it is not effective at reaching into the recesses of a pit and can also result in measurement errors. Visual inspection alone can provide a general idea about the condition of a pit but cannot yield specific depth information.

Overall, a depth gauge is the preferred and most effective tool for accurately determining the depth of a pit, ensuring that inspections are based on reliable data for evaluating vessel integrity.